PROCESS TEMPERATURE TRANSMITTER WITH IMPROVED SENSOR DIAGNOSTICS
First Claim
1. A process temperature transmitter operable with at least one temperature sensor having a plurality of leads, the temperature transmitter comprising:
- measurement circuitry operably coupleable to the at least one temperature sensor to provide an indication of an electrical parameter of the at least one temperature sensor;
a controller coupled to the measurement circuitry to obtain the indication and provide a process temperature output;
a current source configured to apply a test current to the plurality of leads simultaneously; and
diagnostic circuitry configured to measure a voltage response on each lead and responsively to provide a diagnostic indication of the temperature sensor.
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Accused Products
Abstract
A process temperature transmitter is operable with at least one temperature sensor having a plurality of leads. The temperature transmitter includes measurement circuitry operably coupleable to the at least one temperature sensor to provide an indication of an electrical parameter of the at least one temperature sensor. A controller is coupled to the measurement circuitry to obtain the indication and provide a process temperature output. A current source applies a test current to the plurality of leads simultaneously. Diagnostic circuitry measures a voltage response on each lead in order to provide a diagnostic indication of the temperature sensor.
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Citations
20 Claims
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1. A process temperature transmitter operable with at least one temperature sensor having a plurality of leads, the temperature transmitter comprising:
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measurement circuitry operably coupleable to the at least one temperature sensor to provide an indication of an electrical parameter of the at least one temperature sensor; a controller coupled to the measurement circuitry to obtain the indication and provide a process temperature output; a current source configured to apply a test current to the plurality of leads simultaneously; and diagnostic circuitry configured to measure a voltage response on each lead and responsively to provide a diagnostic indication of the temperature sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of diagnosing at least one temperature sensor connection with a process temperature transmitter, the method comprising:
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applying a test current to a plurality of leads of the at least one temperature sensor simultaneously; detecting a voltage response on each lead of the at least one temperature sensor; and generating a diagnostic indication relative to the at least one temperature sensor based on the voltage response on each lead. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A process temperature transmitter operable with at least one temperature sensor having a plurality of leads, the temperature transmitting comprising:
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means for applying a test current to the plurality of leads of the at least one temperature sensor simultaneously; means for detecting a voltage response on each lead of the at least one temperature sensor; and means for generating a diagnostic indication relative to the at least one temperature sensor based on the voltage response on each lead.
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Specification